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EWG's Tap Water Database — 2021 UPDATE

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Arsenic

South Tahoe PUD - Main

Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.

MORE ABOUT THIS CONTAMINANT

 

166

Samples

0

Samples exceeding legal limit (MCL)

87

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.38 ppb2812ND - 7.30 ppb
20152.52 ppb3516ND - 8.40 ppb
20162.11 ppb2210ND - 5.50 ppb
20172.21 ppb209ND - 5.40 ppb
20183.36 ppb3020ND - 8.30 ppb
20193.02 ppb3120ND - 8.00 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.004 ppb

The EWG Health Guideline of 0.004 ppb for arsenic was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 10 ppb

The legal limit for arsenic, established in 2001, was based on costs for arsenic removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to arsenic exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2014-04-239590-054-09446.30 ppb
2014-04-239590-055-0951ND
2014-05-149590-054-13335.00 ppb
2014-06-189590-023-11315.90 ppb
2014-06-189590-042-1223ND
2014-06-189590-050-10067.30 ppb
2014-06-189590-058-0852ND
2014-06-189590-060-1225ND
2014-06-209590-036-16064.40 ppb
2014-06-259590-054-12006.00 ppb
2014-06-259590-055-1210ND
2014-07-169590-012-1055ND
2014-07-169590-052-1030ND
2014-07-169590-054-11234.40 ppb
2014-07-169590-055-1130ND
2014-07-169590-057-0947ND
2014-08-159590-054-09305.00 ppb
2014-08-159590-055-0938ND
2014-08-209590-006-0953ND
2014-08-209590-016-1241ND
2014-09-179590-054-10406.10 ppb
2014-09-179590-055-1049ND
2014-10-089590-054-11106.00 ppb
2014-10-089590-055-1119ND
2014-11-259590-054-09205.60 ppb
2014-11-259590-055-0930ND
2014-12-039590-054-10254.60 ppb
2014-12-039590-055-1030ND
2015-01-079590-054-10054.70 ppb
2015-01-079590-055-1014ND
2015-02-119590-054-10055.70 ppb
2015-02-119590-055-1026ND
2015-03-319590-054-08315.40 ppb
2015-03-319590-055-0841ND
2015-04-159590-054-08305.80 ppb
2015-04-159590-055-0840ND
2015-05-069590-054-09435.60 ppb
2015-05-069590-055-0956ND
2015-06-039590-054-13145.80 ppb
2015-06-039590-055-1323ND
2015-06-249590-023-09206.70 ppb
2015-06-249590-036-09385.20 ppb
2015-06-249590-042-0820ND
2015-06-249590-050-09058.40 ppb
2015-06-249590-058-0820ND
2015-06-249590-060-0850ND
2015-07-229590-012-0951ND
2015-07-229590-052-0921ND
2015-07-229590-054-08535.00 ppb
2015-07-229590-055-0902ND
2015-07-229590-057-08362.20 ppb
2015-08-049590-006-0922ND
2015-08-049590-016-1028ND
2015-08-269590-054-09565.30 ppb
2015-08-269590-055-1005ND
2015-09-169590-054-10085.90 ppb
2015-09-169590-055-1018ND
2015-10-149590-054-11135.40 ppb
2015-10-149590-055-1123ND
2015-11-199590-054-10236.20 ppb
2015-11-199590-055-1029ND
2015-12-029590-054-10015.00 ppb
2015-12-029590-055-1012ND
2016-01-139590-054-10305.40 ppb
2016-01-139590-055-1042ND
2016-03-169590-054-11114.60 ppb
2016-03-169590-055-1122ND
2016-04-069590-054-10045.30 ppb
2016-04-069590-055-1013ND
2016-05-189590-054-10304.60 ppb
2016-05-189590-055-1038ND
2016-06-019590-054-09154.40 ppb
2016-06-019590-055-0925ND
2016-07-209590-012-0906ND
2016-07-209590-052-0949ND
2016-07-209590-054-09504.80 ppb
2016-07-209590-057-08302.10 ppb
2016-08-179590-054-08254.60 ppb
2016-08-179590-055-0832ND
2016-08-249590-006-0917ND
2016-08-249590-016-0923ND
2016-10-129590-054-12005.50 ppb
2016-10-129590-055-1214ND
2016-11-029590-054-11115.20 ppb
2016-11-029590-055-1117ND
2017-01-129590-054-10115.10 ppb
2017-01-129590-055-1021ND
2017-02-089590-054-10145.10 ppb
2017-02-089590-055-1029ND
2017-03-089590-054-09494.20 ppb
2017-03-089590-055-0958ND
2017-04-129590-054-10554.80 ppb
2017-04-129590-055-1105ND
2017-05-169590-054-09414.00 ppb
2017-05-169590-055-0951ND
2017-07-119590-053-1215ND
2017-07-119590-055-0855ND
2017-09-069590-054-09595.30 ppb
2017-09-069590-055-1016ND
2017-10-189590-054-15015.40 ppb
2017-10-189590-055-1508ND
2017-11-159590-054-10155.00 ppb
2017-11-159590-055-1022ND
2017-12-069590-054-12105.30 ppb
2017-12-069590-055-1220ND
2018-01-109590-054-10085.70 ppb
2018-01-109590-055-1022ND
2018-02-079590-054-10175.60 ppb
2018-02-079590-055-1026ND
2018-03-079590-054-09124.80 ppb
2018-03-079590-055-0921ND
2018-03-159590-054-09166.50 ppb
2018-03-159590-055-0929ND
2018-04-049590-054-10096.20 ppb
2018-04-049590-055-1017ND
2018-05-099590-054-10145.60 ppb
2018-05-099590-055-1025ND
2018-06-059590-060-1318ND
2018-06-129590-006-1011ND
2018-06-139590-054-10265.80 ppb
2018-06-139590-055-1037ND
2018-07-189590-036-09104.60 ppb
2018-07-189590-050-10138.30 ppb
2018-07-189590-054-11225.70 ppb
2018-07-189590-055-11442.00 ppb
2018-07-189590-057-10232.10 ppb
2018-07-189590-058-0948ND
2018-08-159590-054-12216.10 ppb
2018-08-159590-055-12292.00 ppb
2018-09-049590-054-09457.80 ppb
2018-09-049590-055-10082.90 ppb
2018-10-109590-054-10306.00 ppb
2018-10-109590-055-10522.20 ppb
2018-11-299590-054-09005.20 ppb
2018-12-199590-054-11105.60 ppb
2019-01-029590-054-10535.70 ppb
2019-02-069590-054-11235.30 ppb
2019-02-069590-055-1134ND
2019-03-139590-054-10086.10 ppb
2019-03-139590-055-1022ND
2019-04-029590-054-11456.10 ppb
2019-04-029590-055-1155ND
2019-05-159590-054-09535.90 ppb
2019-05-159590-055-1003ND
2019-06-189590-012-1000ND
2019-06-189590-016-1319ND
2019-06-189590-042-0933ND
2019-06-189590-060-10352.80 ppb
2019-07-109590-036-15494.50 ppb
2019-07-169590-054-11135.60 ppb
2019-07-169590-055-1118ND
2019-08-079590-050-11088.00 ppb
2019-08-079590-054-11355.50 ppb
2019-08-079590-055-1156ND
2019-08-079590-058-1030ND
2019-08-209590-023-10006.20 ppb
2019-08-209590-052-0934ND
2019-09-119590-054-11485.40 ppb
2019-09-119590-055-11532.00 ppb
2019-10-029590-054-08494.80 ppb
2019-10-029590-055-08572.00 ppb
2019-10-229590-057-09372.10 ppb
2019-11-139590-054-14045.90 ppb
2019-11-139590-055-14132.30 ppb
2019-12-049590-054-14435.30 ppb
2019-12-049590-055-14482.10 ppb